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close this bookElectrical Machines - Basic Vocational Knowledge (IBE - Deutschland; 144 pages)
View the documentIntroduction
Open this folder and view contents1. General information about electrical machines
Open this folder and view contents2. Basic principles
close this folder3. Execution of rotating electrical machines
View the document3.1. Size
Open this folder and view contents3.2. Designs
Open this folder and view contents3.3. Degree of protection
close this folder3.4. Cooling
View the document3.4.1. Cooling category
View the document3.4.2. Cooling category designation
Open this folder and view contents3.5. Mode of operation
View the document3.6. Heat resistance categories
Open this folder and view contents3.7. Connection designations of electrical machines
Open this folder and view contents3.8. Rotating electrical machines in rotational sense
View the document3.9. Rating plate
Open this folder and view contents4. Synchronous machines
Open this folder and view contents5. Asynchronous motors
Open this folder and view contents6. Direct current machines
Open this folder and view contents7. Single-phase alternating current motors
Open this folder and view contents8. Transformer

3.4.2. Cooling category designation

The coolant category designation indicates:

Type of coolant
Nature of the cooling cycle
Method of the coolant circulation


1. Code letters of the cooling IC

2. Type of coolant











carbon dioxide








(Where air only is used for cooling the letter “A” can be dropped.)

3. Cooling cycle arrangement (1st index)

4. Method of coolant circulation (2nd index)

Coolant designation pattern:


IC 01

air-cooled machine, free cycle, self-cycle cooling


air-cooled machine, two cooling cycles, primary coolant dissipates its heat from the casing surface (4); the primary coolant is in self-cycle (1) whilst the coolant circulates freely (0) coupled with self circulating coolant effects (1)


Primary coolant is hydrogen; the heat is led off from the casing surface, the hydrogen features a self-cycle; air is used as secondary coolant; the air circulates freely during self-cooling.

The openings through which the air enters must remain uncovered. Improper machine erection resp. any obstruction of cooling air passage paves the way for both heat damage and possible emission through soilage. Consequently, all machine cooling devices must be regularly serviced.

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